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(No Model.) 2 Sheets-Sheet 1. G. B. GOTTRELL.

SET OF]? MECHANISM FOR PRINTING "PRESSES. No. 414,680. Patented Nov.12,1889.

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0. B'. COTTRE LLQ SET OFF MECHANISM FOR PRINTING PRESSES.

No. 414,680. Patented NOV. 12, 1889.

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CALVERT B. COTTRELIJ, OF

PATENT EEIcE.

IVESTERLY, R-IIODE ISLAND.

SET-OFF MECHANISM FOR PRINTING-PRESSES.

SPECIFICATION forming part of Letters Patent No. 414,680, dated November12, 1889.

Application filed May 9, 1889.

of Westerly, in the county of \Vashington. F

and State of Rhode Island, have invented certain new and usefulImprovements in Set- Olf Mechanism for Printing-Presses, of which thefollowing is a specification.

My invention relates to that kind of printing-machines known asperfecting-presses.

Previous to my invention numerous contrivances have been devised andsuggested for preventing offset from the second impression-cylinder tothe paper being printed while the latter is undergoing its perfectingoperation, or receiving its impression on the second side.

In patents granted to me March 21, 1876,

Nos.175,036 and 175,037,are shown, combined with the secondimpression-cylinder, automatically-shifting tympans for preventingaccumulation of the ink, and hence for lessenin g the liability ofset-off upon the second side of the sheet or web being printed.

The object of my present invention is to provide simple and effectivemeans for overcoming the objection alluded to; and to this end itconsists in the features of construction and combinations of deviceshereinafter more fully described, and particularly pointed out in theappended claims.

In the accompanying drawings, Figure 1 is a side view of aperfecting-press embodying my invention, with the frame-work broken awayfor the sake of clearness. Fig. 2 is a top or plan view of the same.Fig. 3 is avertical section taken in a plane represented by the line cc(1!. Fig. 4 is a perspective view of the scraping-roller ratchet-wheel.Fig. 5- is a similar view of one end of the scraping-roller. Fig. 6 isasirnilar view of the other end of the scraping-roller. Fig. 7 is a likeview of the bearings for the end of the roller shown at Fig. 6. Fig. Sisa side elevation showing a modification of my invention.

In the several views the same parts will be found designated by the samenumerals of reference.

2 represents the frame-Work of the machine; 3, the first form or typecylinder; 4, the first impression-cylinder; 5, the second formoylinder,and 6 the second impression-cylin- $erial No. 310,092- (No model.)

-der. The gearing usually employed for rotating these various cylindersis purposely omitted to simplify the drawings.

Those skilled inthe art will readily understand how to build the machineto obtain the requisite movement of the parts.

I The second impress1on-cylinder 6 is pref erably divided into fourimpression-surfaces .7, S, 9, and 10. For each of suchimpressionsurfaces is provided a shifting tympan 11, .which is adaptedto operate in the manner described, and illustrated in my aforesaid lpatent, No. 175,037. The means for shifting said tympans may beconstructed as shown in either of my before-mentioned patents, or may bedifferently constructed. The arrows (1 indicate the directions ofrotation of the cylinders, and the arrows b the directions of movementof the tylnpans. The tympans wind from rollers 13 in a directionopposite that in Which the impression-cylinder 6 travels and while thelatter is in motion.

14: designates the paper to be printed, which may be supplied from aroll, as indicated at 15.

16 and 17 represent a pair of cutting or severing cylinders providedwith cuttingrate the web 14 into sheets subsequent to the printingoperation.

with a soft absorbent covering or surface 21, which is arranged tocontact with the surface of'the tympans as they pass it. This roller 20is designed to remain stationary for a given length of time, and thusserve the function of a scraper for the tympans. It is also designed incontact with the tympans a fresh portion of its periphery.

One end of the scraping-roller is provided with a cylindrical journal22, adapted to fit in a box-bearing or support 23, aiiixed t0 the mainframe. This bearing is provided with a hinged cap or cover 2i and athumb-screw 25, which engages with a threaded hole in the box 23, andforms a convenient means sition. The other end of the scraping-roller isformed or provided with a square or angular stud 26, which is fittedinto a corresponding seat 27 in line with a cylindrical journal 28,which is seated in a bearing 29, formed in blades 18 and 19,. adapted toshear or sepa- 2O designates a'soraping-roller provided for maintainingthe journal 22 in operative po-' to be periodically partially rotated tobring a bracket or block 30, secured to the main frame.

Preferably formed integral with the journal 28 is ahub 31 andaratchet-wheel 32,in which is formed or provided the angular seat 27.

Journaled or fulcrumed upon the hub is alever 33, provided with a pawl34 for driving the ratchet-wheel and through it the scrapingroller. Thelower end of the lever 33 is pivoted to one end 'ofa link 35, whoseother end is pivoted to another lever 36, (see Fig. 1,) which isfulcrumed at 37 and provided with an anti-friction roller 38. On theshaft 39 of the cylinder 16 is provided an eccentric or cam 40, whichruns in contact with said antifriction roller and actuates the lever 36,and through its connections the driving pawl or finger 35. A spring, as41, suitably arranged,

- the ink obtained by the offset.

serves to hold the lever 36 in operative engagement with the cam 40.Pivoted in the bracket 30 is a dog 42 for preventing rotation of thescraping-roller by the frictional contact of the secondimpression-cylinder surfaces, so that at the desired periods of time thesaid roller may remain motionless and perform its intended function of ascraper.

As illustrated, the paper passes between the form-cylinder 3 and thefirst impressioncylinder 4, thence between the second formcylinder 5 andthe perfecting or second impression-cylinder 6, and finally between thesevering-cylinders 16 and 17. In passing between the cylinders 3 and atone side of the paper is printed, and in passing between the cylinders 5and 6 the opposite side of the paper is printed. WVhile the printing ofthe second side of the paper takes place the freshly-printed oppositeside is presented to one of the tympans of the secondimpression-cylinder and portions of the ink thereof are transferred tosaid tympan, forming thereby what is known as the offset. \Vhen saidtympan has passed beyond the form-cylinder 5 and the scraping-roller, itis shifted or fed lengthwise in the direction of the arrow from theroller 12 to the roller 13 in the manner and for the purpose set forthin my previously-obtained Letters Patent. The doublyprinted or perfectedportion of the Web then passes between the cylinders 16 and .17 and iscut off or severed. After leaving the formcylinder 5 the tympan ispresented to the action of the scraping-roller for the removal of' Thescraping-roller covering or sheath of cotton flannel,

felt, or other soft material is dampened or moistened with benzine orits equivalent. As the tympan is carried past the stationary dampenedscraping-roller the ink on the tympan is softened or dissolved andscraped off and absorbed by said roller. At the desired time thescraping-roller is partially rotated to bring into play a fresh or cleanportion of its surface. Preferably the scraping-rolleris given twoforward movements, or turned the distance of two notches of itsratchet-wheel to each complete revolution of the secondimpression-cylinder. This relative movement of the scraping-roller andthe second impression-cylinder may, however,be changed at the pleasureof the builder. It is desirable, however, to effect the step-by-step orperiodic r0- tations of the scraping-roller as seldom as possible, inorder that the scraped-01f ink may come on at the front edges of theimpressionsurfaces of the cylinder and the soiled portions pass off atthe rear edges thereof. 7

By the employment together of the shifting tympans and thescraping-roller there is little or no liability of offset occurring,because, besides the continual presentation of new portions of thetympans, the exposed 'surfaces of the tympans are constantly subjectedto the action of the scraping-roller. If desired, the tympans may beshifted by hand in lieu of automatically.

So far as some of the features of my invention are concerned the tymanmay be immovable, or may be dispensed with entirely.

When it may be desired to remove the scraping-roller and insert a newone, the cap 24 is unfastened and swung up, the journal 22 raised fromits bearing, and the roll pulled endwise to withdraw the angular stud 26from its seat. a

In the modification shown at Fig. 8 the eccentric for operating thescraping-roller is mounted on the shaft of the secondumpression-cylinderinstead of the cutting-cylinder.

Various other modifications in detail construction and arrangement maybe made without departing from the spirit of my in? vention.

What I claim as new, and desire to secure by Letters Patent, is

1. In a perfecting-press, the combination,

with the second impression cylinder, of a roller adapted to be heldstationary to act as a scraper, substantially as set forth.

2. In a perfecting-press, the combination, with the secondimpression-cylinder, of a scraping roller normally stationary, andmeans, substantially as described, for periodically partially rotatingit, substantially as described.

3. In a perfecting-press, the combination, with the secondimpressioncylinder, of a scraping-roller having a ratchet-wheel, a dogengaging therewith to normally hold said roller stationary, and adriving-pawl for pcriodically partially rotating said roller,substantially as described.

4. In a perfecting-press, the combination, with the second impressioncylinder provided with a series of shifting tympans, of a stationaryroller adapted to scrape the surscraping-roller having a cylindricaljournal at one end and an angularstud at the other,

and a hub provided with an angular seat for 15 the said stud, and with acylindrical journal and journal-bearings for said journals,substantially as set forth.

Signed at New York, in the county of New York and State of New York,this Bth'dayof 2o May, A. D. 1889. y

' CALVERT l3. COTTRELL.

lVitnesses:

PHILLIPS ABBOTT, JACOB FELBEL.

